Improvement in molds for casting metals



UNITED STATES PATENT OFFICE.

C. Il. COTTEII, OF MILITORD, PENNSYLVANIA.

IMPROVEMENT IN MOLDS FOR CASTING METALS.

Speeilication forming part of Letters Patent No. 36,9,13, dated November B, ITIL.

To all who/n, t may f-o/werlr: l this is not really necessary, nor do I make Be it known that I, C. l5. CUTTER, of Mill any claim to the use of that material, except, ford, in the county of like, in the State ofl in combination with the ashes. Having thus Pennsylvania, have invented a new and imprepared the composition, 1 place one-half of proved material for forming molds for casting the pattern upon a smooth surface within oneall kinds of metals, and for lining stoves, t halt' ofthe flask, and till fromthe back, pressoupolas, and such other places requiring a A ing closely as I till. \Vhen the two parts of substance capable of resisting great heat; and i the pattern have been molded, I place the I do hereby declare that the following is a j two filled parts of the iiask together, the patfull and exact description thereof. l tern remaining in, and submit the same to a The nature of my invention consists in promoderate degree ot' heat forabout twentyfonr viding a material which, when formed into i hours. I then separate the mold, take out molds, will be durable, allowing the same t the pattern, and submitthe rejoined parts of mold to be used several times over, and at the mold to a heat increasing gradually to a the same time producing a very smooth eastdegree nearly sutilcient to melt the iron flask.

i 1ng-mnch smoother than can possibly be ob l The mold is then ready for use. The pattern tained from a sand mold. l must be in two parts, and each halt'of the To enable others skilled in the art to which mold filled and pressed separately. my invention pertains to make and use my l If desirable, the mold thus formed may subinvention, I will proceed to describe the masequently be broken up and redissolved in terials employed and the process I adopt in water, and will answer as well as before for incorporating and using the same. forming a new mold. I take higlggry or other hard wood shes,\\ What I claim is sift and grind the same tot ie neness ot tlonr. l The composition, substantially as above de- I then take any given quantity of water and i scribed, whether the saine be of ashes and lye dissolve in it as mneh of what is commonly l alone, or the same in combination with the known as concentratedlve (such as is ordihydraulic or plastic cement, as and for the narily sold a "'st'o'es *as* e water is capable purposes set forth.

l 1 l l of dissolving, and with this soElutlon I dampen the prepared ashes, and mix or grind the same to the consistency of putty prepared for use. 'itnesses:

C. B; COTTEP.

In some cases I add about one-fourth part of l J. B. ALLEN, hydraulic or plastic cement to the ashes; but i JOHN CARPEXTER. 

